Hot air furnace



Sept. 11, 1934.

R. B. RAINEY 1,973,016

HOT AIR FURNACE Filed June 17, 1933 2 Sheets-Sheet 2 x /cs. 6.

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Patented Sept. 11, 1934 unrrep STATES PATENT QF'FIQE 4 Claims.

My. present invention relates to improvements in hot air furnaces orheating systems for domestic and other uses, and the inventioncontemplates, the employment of an auxiliary radiator, and enclosingcasing or jacket for the furnace and radiator.

In carrying out my invention I utilize any suitable type of hot-airfurnace, and I attach the auxiliary radiator, which is of novel butsimple construction, to the smoke outlet from the furnace, and thefurnace and auxiliary radiator are enclosed Within a casing or jacketforming a hot air chamber. The enclosing jacket or casing is providedwith a removable top, and with re movable side walls in order thataccess may be had with facility to the interior of the casing and to thefurnace and radiator for repairs, adjustments, and for cleaningpurposes.

The auxiliary radiator through which the smoke from the furnace isconducted is provided with a damper to providefor either a direct draftor an indirect draft from the furnace to the chimney or smokepipe, andthe radiator is located in the upper part'of the heatingchamber thatsurrounds the furnace.

The walls forming the casing or jacket of the heating chamber arefashioned of porous, heatinsulating material, which material is perviousto air, and the heating chamber, in addition to the usual cold-air ductleading thereto, is thus adapted to receive air from the atmosphere,this movement of the air through the walls of the casing taking placethrough induction caused by the flow of hot air from the heating chamberwhen the furnace .is in operation.

The hot air is conveyed from the heating chamber, or the interior of thecasing, through the usual hot air ducts, and releasedin the variousrooms of ahouse through the usual registers or other outlets. I

It will be understood that the casing or jacket may be varied in sizeand in shape for the purpose ofradapting it to various types offurnaces, and the casing and auxiliary radiator may be lo cated indifferent positions with relation to the furnace, thus accommodating-theequipment of my invention to conditions in the cellar or basementinwhich, the apparatus is ,utilized, and also accommodating the apparatusto objects surrounding the furnace. j

The auxiliary radiator as well as the casing or jacket may beconstructed in standard sizes and shapes for use with complementaryfurnaces, or my equipment may be applied to furnaces now in use by firstdisplacing the usual heating drum or outer casing of the furnace, andsubstituting therefor my enclosing casing or jacket-together with theauxiliary radiator.

The invention consists in certain novel combinations and arrangements ofparts as will hereinafter be more fully set forth and claimed. In g theaccompanying drawings I haveillustrated one complete example of. thephysical embodiment of my invention wherein theparts are combined andarranged according to one mode I have thus far devised for the practicalapplication of the principles of my invention, butit will be understoodthat various changes and alterations may be made in the exemplifiedstructure within the scope of. my appended claims,flwithout departingfrom the principles of my invention.

' Figure 1 is a View with the jacket or casing in vertical section, andshowing the relation of the furnace and auxiliary radiator within thecasing, the radiator also being shown in section.

Figure '2 is a top plan View of the apparatus, with the top of thecasing removed for convenience of illustration.

Figure, 3 is a view showing the auxiliary radiator in-elevation and'detachedv Figure 4 is a perspectiveyiew of one of the frames of the tworemovable side walls of the casing, and Figure 5 1s asimilar view of oneof the end Walls of the casing.

Figure 6 is an enlarged sectionalv detail-view near the top of thecasing, at a corner, showing the manner of securing the upper part ofthe removable side wall to an end of the casing;

Figure '7 is a similar View atthe bottom corner of the casing showingthe manner of bolting. the removable side wall to theen'd wall of theeas- Figure 8 is a detail sectional view at one corner of the casing,showing the manner in which the removable'top of the casing is retainedat the upper edges of the vertical walls of the casing.

In order that the general arrangement and relation of parts may readilybe understood I have illustrated in Figures 1 and 2 a wellkn'own type ofhot air furnace havingthe'u'sual ash 'pit'-1-', -the fire pot" 2 andheating drum 3;the latter being provided with a smoke outlet 4at itsrear. The

usual ash door5 and coal door Gare-indicated at the front of thefurnace,and other accessories of the furnace are of course employedalthoughnotillustrated. I I preferably locate the auxiliary radiator at the rear ofthe furnace in a slightly. elevated position with relation to thefurnace, and the auxiliai'y radiator, which is' horizontally disposedtransversely of'the furnace comprises one or more units, of which eachunit includes two parallel flues 7 and 8, spaced apart and joined neartheir ends by cross flues 9 and 10. These flue-s are preferably of thinsheet metal, and while I have shown them as of cylindrical shape, itwill be understood that other shapes may be given to the flues, in crosssection. One of the cross flues, as 9 is provided with a circular damper11 of well known type, and the pivot rod 12, which extends outside thecasing and is journaled in the walls of the cross flue 9, may be turnedto cause a direct flow of smoke from the furnace to the chimney, as whenthe furnace is being fired, o'rv when the fire is being started in thefurnace.

The damper 11 may also be turned to close, or substantially close, thecross flue 9,. and thereby cause the smoke to pass indirectly to thechimney through the flue '7, cross flue 10, and" the second flue 8,thence through the thimble 13 to which through an open end of a flue forthe purpose of removing accumulated soot and ash-dust.

- One of the flues, as 7, is connected to the smoke outlet 4 of thefurnace by a double elbow section 14, located beneath the flue 7, andconnected. to the smoke outlet 4 by the connection 15, and to the flueby connection 16, a flange 16' being provided at the underside of theflue for the telescopic connection of these parts. The connections ofthis lower section of the auxiliary radiator, that is, the double elbow,are of the usual telescopic type, and it will be apparent that the lowersection14 may be adjusted in manner usual for smoke pipes. Thus, ifconditions require, the auxiliary radiator may be turned around so thatthe thimble 13 will be at the lower end of Figure 2, as will also thecross flue 9, and the lower section 14 of the radiator may also beturned on its swivel joints 15 and 16, and of course the thimble 13 maybe removed from the end of flue 8 and placed at the other end of thatflue, or at either end of flue '7. Because of this simplicity inconstruction of the auxiliary radiator, it may readily be adapted tovarying conditions, to insure-most efficient disposition of the gases ofcombustion, and to utilize the heat from these gases in the hot-air orheating system.

The four ends of the two flues '7 and 8 are sup-- ported in thesidewalls of the casing or jacket that surrounds the. furnace and theauxiliary radiator, and these walls are designated as units as frontwall 1'7, rear wall 18, and removable side walls 19 and. 20. The endwalls and the side walls are joined together, as will be described, anda removable top, indicated as a whole by the number21, fits over the topedges of the upright walls, all as indicated in Figure 1, to retain thewalls, and to close the hot air chamber.

Theremovable top of the casing is provided witha number-of thimbles 22properly secured therein and adapted to support the hot-air ducts orflues that are fitted over the thimbles, and of course the hot air risesfrom the top portion of the hot air chamber through these outlets to theheating system of the house. I V A -cold air duct is connected to athimble 23, located near the bottom of the casing and extended throughone of the side walls, and this connection 23 is preferably located nearthe furnace in order that the cold air may circulate around the exteriorof the furnace. The cold air duct that leads to the thimble 23 Ipreferably connect withan intake that is set in the floor of a room, orin the side wall of a room at the bottom of a stairway, in order thatthe cold air may be drawn to the furnace from the various parts of adwelling, while the warm air is being conveyed to these rooms from thefurnace, through the warm air ducts from the thimbles 22.

.In addition to the supply of cold air at the intake 23, air from theatmosphere surrounding the casing is drawn through the walls of thecasing due to the construction of these walls. Thus I employ a wiremeshor screen 24 upon which is built a porous layer or body 25 ofappropriate thickness. The composite 'wall is built up from plasticasbestos, which is not only a heat insulating material, but is alsoporous, and when dried, is comparatively light in weight. While I haveindicated the screen or reinforcing-base as of reticulated metal, itwill be understood that any perforated material suitable for a base maybe employed, and any other heat-insulating material that is pervious toair may be built upon the reticulated base.

The use of the material, as asbestos, in the composite wall, that ispervious to air, provides a wall through which air from the cellar orbasement may be drawn to the heating chamber within the casing andsurrounding the furnace and radiator. In its passage through thecomposite wall, the air is filtered or cleansed of dust and the dustfrom the cellar or basement is prevented from reaching the heated roomsof a dwelling. The exterior faces of the composite walls should becleansed at suitable intervals, to remove dust accumulated from theatmosphere, and thus maintain the-efficiency of the composite walls inadmitting air to the heatingchamber.

The composite, porous, heat insulate-d walls are fashioned on frames,oneof the side-wall frames being indicated as 26 in Figure 4, andone ofthe end-wall frames being indicated as'2'7 in Figure 5, and the screens24 are attached to or supported in these frames in any suitable mannerto receive the porous covering 25.

Each side frame comprises a top angle iron28,

two angle iron posts 29, 29, and a bottom strap of metal 30, and asindicatedin Figure 4 bolt holes 31 are provided in the frame 26 at itslower corners. Near the upper corners of this frame are fastened a'pairof'angle'lugs 32 that areattached at the outer sides of the post's29,and

these lugs project inwardly of the casing, beneath the angleirons 28. r

The end frames2'7 each 'compriseran upper angle bar 33, two uprightposts 34,34, and an angle iron '35 at thebottom, these four parts being"rigidly secured together in suitable" manner;

Each of" the four posts v34, on their side faces;

are provided with bolt holes 36 that register with the bolt holes 31 ofthe side frames,

V The angle iron bars28, 29, 29 of. theside time are adapted to fitoverthe'side edges of the two end frames, the two lugs 32, 32 of the sideframe sliding in frictional contact with the inner, side edges of theposts 34 of the ends. After the side frame has been thus applied to thetwo end frames,-bolts '37.are passed through the registerfing holes 36and 31, and the nuts '37 are then applied to the bolts, and screwed homefor the purpose of rigidly connecting thefour walls of the casing aroundthe bottom. The lugs 32, which pass through slots or holes, not shown,in the composite walls, fit snugly against the posts 34 of the ends ofthe casing, and by their frictional engagement therewith retain thewalls in proper position. These slots 01' holes in the composite walls,are closed, by plastering around the lugs after the furnace is set up,and of course the slots or holes do not show in the completed furnace.

The top of the casing is also of composite material, if desired, andthis top wall fits over the top edges of the four upright walls of thecasing to retain the structure in rigid position. The casing-top isfashioned with a rectangular frame made up of angle iron bars 29 thatare complementary to and fit over the top bars 28, 28 of the sideframes, and the top bars 33, 33, of the end frames, as indicated inFigures 1 and 8, and to further brace the structure, the rectangularframe 39 is also provided with angle braces or lugs 40 secured to theframe and projecting downwardly to frictionally engage the inner edgesof the top flanges of the bars 33 and 28. Thus it will be apparent thatthe casing walls are rigidly bolted together at their lower edges, andthey are rigidly retained at their upper edges by means of the top-frame39 and the retaining lugs 40 of this top frame.

The casing may thus readily be assembled about the furnace and theauxiliary radiator, and if desired, as for cleaning the interior of thehot air chamber, the top may be lifted, and then one of the side wallsmay be removed to give Having thus fully described my invention, what Iclaim as new and desire to secure by Letters Patent is:

1. The combination in, a heating apparatus, with a furnace, of anenclosing casing comprising a composite filter-structure ofheat-insulating material that is pervious to air, said casing havingseparable end walls, separable side walls for the casing and means forattaching the side walls to the end walls, a removable top, and coactingmeans on the top wall and the vertical walls for guiding the top wall toposition and for retaining the side walls and end walls in uprightposition.

2. In a heating apparatus, the combination in an enclosing casing havingseparable end Walls, of separable side walls having angle iron top barsand end posts fitted over the edges of the end Walls, bolts and nutssecuring said side walls to the end Walls at the lower edges of thesidewalls, retaining lugs mounted on the side walls and engaging the endwalls, a removable top for the casing, exterior flanges on said topfitted over the top edges of the upright walls, and depending guide lugsmounted on the top engaging the inner edges at the tops of the uprightwalls.

3. The combination in a heating apparatus, with a furnace, of anenclosing casing for the furnace having hot-air outlets, said casingcomprising a filter-structure of heat-insulating material that ispervious to air, whereby the supply of air to be heated passes throughthe filter-structure to the interior of the casing.

4;. The combination in a heating apparatus, with a furnace, of anenclosing casing for the furnace comprising a filter-structure ofheatinsulating material that is pervious to air, said casing havingseparable walls, fastening means for the walls, and a top for the casinghaving hot-air outlets.

ROBERT B. RAINEY.

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